1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Conservation of energy

  1. Oct 30, 2012 #1
    I don't know if I'm setting up the energies correctly.

    1. Two objects are connected by a light string passing over a light, frictionless pulley. The object of mass m1=5.00kg is released from rest at a height h=4m above the table. Using the isolated system model, (a) determine the speed of the object of mass m2=3.00kg just as the 5.00-kg object hits the table and (b) find the maximum height above the table which the 3.00-kg object rises.



    2. E1=Ef
    KE=.5mv2
    U=mgh




    3. Ei=Ef
    m1gh=m2gh + .5(m1+m2)v2
    5(9.8)(4) = 3(9.8)(4) + .5(8)(v2
    v=4.43m/s
     
  2. jcsd
  3. Oct 31, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi Kuklinski! Welcome to PF! :smile:
    Yes, that looks fine. :smile:

    What's worrying you about it? :confused:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook